The SEQUOYAH Gasification outdoor wood furnaces create less smoke, use less wood while creating more heat. Gasification is a process for burning wood where the gases from the wood are burned at very high temperatures. Downdraft produces extreme heat up to 2000 degrees igniting all gases including smoke and creosote therefore giving almost 100% efficiency ! Less emissions will mean more efficient combustion, which ultimately will mean that you will burn less wood, and there will be less smoke. These outdoor wood furnaces are a down draft gasification unit with exhaust temperatures of less than 300 degrees. It will define a whole new meaning of efficiency in outdoor furnaces. When sized properly you will see true 24 hour burn times between fillings with low emissions, something unheard of in the industry.